This commit does the following changes to the 3ds port:
- Rename the target from ctru to 3ds.
- Rename all files and functions with the ctru naming convention to 3ds.
- Created a new file and folder structure that will better integrate future console ports that share the same codebase.
- Fixed a buffer overflow bug in pcm code.
Change-Id: I17c6f86df64eb99dd2b653485d70832ff46b2ba8
